Monism

 If God is infinite, then the Creator cannot be separate from the Creation.

An infinite God necessarily implies monism; if something is everything, then there’s nothing it can’t be, so there must be only One Thing, namely God (or Nature, as our old friend, Spinoza put it.)

That One Thing can, of course (again, as Spinoza pointed out), have different attributes, but these are just appearances, different manifestations of the One.  Thus, for instance, it may seem as if human beings and God are separate, but that’s like saying that steam and ice aren’t both water, simply because they are different forms of H2O.

Then, if Monism is the case, it seems like Idealism must be the case, as well.  If there’s only One Thing, it has to be mind, not matter, because whereas matter can be accounted for as an appearance in the mind, mind cannot be accounted for as a function of matter without it being something different from matter.

The Materialist can contend that mind cannot exist without matter, but they are still committed to there being two things, one material and the other immaterial.  The Idealist, by contrast, is able to assert that it’s all mind, all the way down, no materials turtles needed at all.

So, if God is infinite, then there’s only One Thing, and that Thing is mind.  Q.E.D.

But maybe God is not infinite.  Maybe God is more like the petty tyrant of the Old Testament or the version we get from Christian televangelists who has small-minded preferences for one sexual orientation or political party over another.  If that’s the case, then sure, the Creation and the Creator can be separate, but it makes for an awfully constrained conception of God.

It also makes possible for the Creation to be good, while the Creator isn’t, like with Picasso or Kanye West.

The Monist perspective, by contrast, ensures that if there’s any good in the world, then God’s all good.